Bip39 Seed Phrase. Is passphrase similar to PIN? No, a passphrase just isn't the same as a PIN. A passphrase, while in the context of Bitcoin wallets, is an extra layer of safety for your wallet that actually works together with your seed phrase to encrypt and defend your wallet. https://getsocialsource.com/story4146659/bip39-list-https-linktr-ee-bip39-a-review-of-bip39-word-list-pdf